A skull-based multiple dipole phantom for EEG and MEG studies

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A versatile phantom for use in evaluating forward and inverse methods for MEG and EEG has been designed and is currently being constructed. The phantom consists of three major components: (i) a 32-element cur- rent dipole array, (ii) a PC-controlled dipole driver with 32 isolated channels allowing independent control of each dipole, (iii) spherical and human-skull mounts in which the dipole array is placed. Materials were selected throughout the phantom to produce minimal field distortions and artifacts to enable acquisition of high quality EEG and MEG data. The dipoles are made from a rigid narrow (0.84 mm) stainless steel coax ... continued below

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5 p.

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Spencer, M.E.; Leahy, R.M. & Mosher, J.C. July 1, 1996.

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Description

A versatile phantom for use in evaluating forward and inverse methods for MEG and EEG has been designed and is currently being constructed. The phantom consists of three major components: (i) a 32-element cur- rent dipole array, (ii) a PC-controlled dipole driver with 32 isolated channels allowing independent control of each dipole, (iii) spherical and human-skull mounts in which the dipole array is placed. Materials were selected throughout the phantom to produce minimal field distortions and artifacts to enable acquisition of high quality EEG and MEG data. The dipoles are made from a rigid narrow (0.84 mm) stainless steel coax cable. The dipole drivers can be configured as either current or voltage sources, are independently programmable and fully isolated, and are capable of producing arbitrary bipolar waveforms up to a 200 Hz bandwidth. The spherical mount is a single shell sphere filled with conductive gelatin. The human skull mount has three shells: ``brain`` (conducting gelatin), ``skull`` (the skull is impregnated with a low conductivity conducting gelatin), and ``scalp`` (a thin layer of rubber latex mixed with NaCl to achieve a conductivity matched to the brain). The conductivities will be adjusted to achieve approximately an 80:1:80 ratio. Data collected to date from the spherical phantom shows excellent agreement between measured surface potentials and that predicted from theory (27 of the 32 dipoles give better than 99.9% rms fit) and negligible leakage between dipoles. We are currently completing construction of the skull mount.

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5 p.

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OSTI as DE96012736

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  • Biomagnetism conference, Santa Fe, NM (United States), Feb 1996

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  • Other: DE96012736
  • Report No.: LA-UR--96-1940
  • Report No.: CONF-9602101--6
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 397096
  • Archival Resource Key: ark:/67531/metadc683233

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  • July 1, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Oct. 3, 2017, 7:24 p.m.

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Spencer, M.E.; Leahy, R.M. & Mosher, J.C. A skull-based multiple dipole phantom for EEG and MEG studies, article, July 1, 1996; New Mexico. (digital.library.unt.edu/ark:/67531/metadc683233/: accessed December 11, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.